Ontake-san (Japan) erupted on 27.9.2014

Image: Wikimedia Commons

Image: Wikimedia Commons

When I logged on the net this morning I found Ontakesan erupted in Japan in Austrian news.They had gotten the name not completely right cause it is Ontake-san. San meaning mountain in Japanese and it is also a title of respect. The name translates as “Honoured Peak” and Ontake is used for some more other mountains in Japan so one needs to specify … Kiso Ontake is meant in this post.

Mount Ontake (御嶽山 Ontake-san?), also referred to as Mount Kiso Ontake (木曽御嶽山 Kiso Ontake-san?), is the second highest volcano in Japan at 3,067 m (10,062 ft) located around 100 km (62 mi) northeast of Nagoya. ( Quote Wikipedia)

Image: Wikipedia Japan

Image: Wikipedia Japan

Ontake-san is a stratovolcano. It is an “independant” volcano, meaning it is not connected to any system but has a system of it´s own and it is situated in Nagano Prefecture Kiso-gunKiso-machi , Otaki Village, Gifu Gero – Takayama 35 ° 53 ’34 “N, 137 ° 28′ 49″ E 100 km north east of Nagano. The highest peak Kengamine (剣ヶ峰), is 3,067 m altitude.

Ontake lies in a caldera with a diameter of approximately 5 km which was created 70,000 – 90,000 years ago. Farther up there is a second caldera which is 2 km in diameter. It seems to date back 23,000 years. Until, 1979 the volcano was dormant until an unexpected eruption happened from October 1979 to April 1980. Smoke and ash rose from several craters of the southern peak. A landslide occurred after an earthquake in 1984 killing 28 people. Fumarolic activity continued but 2008 the alert level was lowered.  In the end of September 2014 the alert level was raised to 3 for the southern part of the volcano.

Image: Wikimedia Commons

Image: Wikimedia Commons

The base of the volcano is 17 km2 and the composition is mostly rhyolite but the upper parts also contain pyroxene and andesite. The longest lava flow that had been produced run 17 km.

5 old craters are filled with lakes. The highest lies on 2,905 m – Ni-no-ike 二ノ池.

On September 27th 2014 it erupted leaving 250 climbers stranded and 7 unconscious. http://ajw.asahi.com/article/behind_news/social_affairs/AJ201409270035

Image Credit  Nagoya Broadcasting Network

Image Credit Nagoya Broadcasting Network

The article above states: “Nagano prefectural officials said hikers reported to Kiso fire authorities that many climbers collapsed on the trekking trail.

Cameras installed by the land ministry’s Chubu Regional Development Bureau show volcanic plumes sweeping more than 3 kilometers down the mountain’s southern slope.” (Quote)

Note that they said sweeping DOWN the southern slope. This may (or may not) describe a pyroclastic flow. A warning of debris flying at a radius of 4 km from the crater is issued.
http://www.japantimes.co.jp/news/2014/09/27/national/central-japans-mt-ontake-erupts-hikers-reported-injured/ states there are 15 cm of ash on the ground.

(Quelle: AP/dpa\Kyodo News)

(Quelle: AP/dpa\Kyodo News)

From http://www.t-online.de/nachrichten/panorama/katastrophen/id_71181648/vulkan-ontakesan-in-japan-ausgebrochen.html (in German)

Image Twitter Hiker stranded on Ontake

Image Twitter Hiker stranded on Ontake

Huffington Post ( in Japanese) http://www.huffingtonpost.jp/2014/09/27/ontakesan-volcanic-eruptio_n_5892000.html 

Image: Wikimedia Commons

Image: Wikimedia Commons

And another image showing more peaceful times at the volcano.

IPTV video on ORF: http://iptv.orf.at/#/stories/2247361/

Webcam : http://www.kaidakogen.jp/livecamera/index.html (Thanks Diana)

Image Twitter

Image Twitter

This image came in via Twitter. It looks more like Mount Unzen than Ontake. If the location is wrong (as it is very often with Twitter images) see it as an image describing what a pyroclastic flow looks like. From the images I saw so far, I think (no expert) an ash cloud moved down the slopes. A pyroclastic flow would have killed the hikers within instants. Spica

Western Pacific : http://www.westernpacificweather.com/2014/09/27/japans-second-highest-volcano-explodes-saturday/

The volcano is popular among hikers because it is really easy to climb. To members of Shugendō- und Shintō-group like Ontake-kyō it has a high religious status and various rituals are practiced on the volcano. So many of the hikers are climbing it not only because of spotivic activities but also because of the religious importance.


Update with contributions from Edward, Esoadrille, Karenz and Rushes which were posted while I was editing:

A collection of images and live reports and even a geological setting.
Rushes: “The animation of quakes in the Mt. Ontake region can be seen here: Seems there was remarkably little warning time.” http://www.data.jma.go.jp/svd/eew/data/hypo/Anime.html

KarenZ: Current VAAC for Onetakesan: Ash at FL260
Initially ash reached FL 370:

Ontakesan has been relatively inactive. Her previous eruption was a VEI 1 but no confirmed Holocene eruption prior to that. From GVP:

And also from GVP:
“The massive Ontakesan stratovolcano, the second highest volcano in Japan, lies at the southern end of the Northern Japan Alps. It is constructed within a largely buried 4 x 5 km caldera and occupies the southern end of the Norikura volcanic zone, which extends northward to Yakedake volcano. The older volcanic complex consisted of at least four major stratovolcanoes constructed from about 680,000 to about 420,000 years ago, after which Ontakesan was inactive for more than 300,000 years. The broad, elongated summit of the younger edifice is cut by a series of small explosion craters along a NNE-trending line. Several phreatic eruptions post-date the roughly 7300-year-old Akahoya tephra from Kikai caldera. Ontakesan’s first historical eruption took place in 1979. A non-eruptive landslide in 1984 produced a debris avalanche and lahar that swept down valleys south and east of the volcano. Ascending this volcano is one of the major objects of religious pilgrimage in central Japan.”

Edward´s Google Fu contributions which reached VC via mail:
This looks like a pretty good assessment of the stuff so far

Here are the results of my google fu – which might contain nuggest of interest
http://www.wovo.org/0803_12.html probably the nearest volcano observatory

and it does mention “Kiso-Ontake” amongst it’s other volcanoes but I don’t know what the prefix kiso means

and this shows that on-take is also the vent name for another volcano in japan http://www.wired.com/2010/02/siusgs-weekly-volcano-report-23-92010-stymied-by-weather/

From Elgjda, a comprehensive overview of previous activity: http://www.data.jma.go.jp/svd/vois/data/tokyo/STOCK/souran_eng/volcanoes/053_ontakesan.pdf


Thanks for the contributions! Spica

1,296 thoughts on “Ontake-san (Japan) erupted on 27.9.2014

  1. It is so beautiful to see…I know most of you know all about volcanoes, but I just watched this documentary on Laki, and it is pretty eye opening to say the least 😦 I hope it is ok for me to post here for others like myself, who are just learning.

    • Thanks Kat. I think it’s very interesting to see what people in the past had said about their experiences. The things that happened and also how they dealt with it.

    • Carl wrote a series of three articles here on Laki – check out the Dragon’s Hoard to read them. Particularly GeoLurking’s estimate of the height of the flames. Serious stuff. 🙂

    • Thanks Kat – that was very prescient of the BBC in 2006 – before Eyaf and her dust cloud disruption to flights across Europe in 2010. I wonder what the long term effects of Bardabunga’s current eruption will be – depending of course on wind direction, gas emissions and how long and how large it will eventually be.

  2. I think the ska ‘s are the ones to look at.

    One is the river out of Kverkjufell, the other is the one out of Grimsvotten, to the south

    Thanks folks !

    • There’s a rainfall spike from the storm, both in Skaftá and Jökulsá – conductivity fell with the rise in levels, all consistent with rain. Flow coming back down. No sign of a hlaup at this time.
      GPS on Bárðarbunga has been going crazy again for last few hours, but no secondary indicators of anything going on.

    • Ska’s as in Skaftá við Sveinstind
      Skjálfandafljót ?

      Since the map does not show rivers, it is hard to see which stations are for rivers south of Grims. Maybe Pomans has a better handle on this than me?

      • I looked at all the graphs surrounding the entire area, including, West and North…all but one were higher than normal, but there has been quite a bit of weather. The only station I found close to Bardarbunga that hasn’t gone down yet was Kreppa, Lónshnjúkur…which is NE of Bard. However, the station between Kreppa, Lónshnjúkur and Bard has already come down, so I am thinking possibly a malfunction? Or just taking it’s time. I also went to the IMO site, and looked at their hydrological graphs, and all of those are pretty much the same, had a spike due to weather, but have since been coming down.

      • Skeiđarársandur is south of Grim, and the outwash plain from previous Jok.

        and maybe Broarjukull , N of Kverkfull

        hal-00480676, version 1 – 4 May 2010

        • I knew I should’ve cleared that up earlier….I did check ALL the graphs surrounding Bardarbunga (I checked the southern ones first because of Grimsvotn and the earlier caldron formation)….I only mentioned West and North, to indicate that I had also checked those, which may be a less likely candidate for flooding 🙂

  3. this is what concerned me. 00:26
    None of the other plots show this as more than a 1
    I know it was still stormy then , but concerned something broke loose

      • I dunno. I find these, and I’m betting it’s one of the Kverkfjoll stations.
        KVEA – JH0519 Kverka
        KVEF – Kverkfjoll NE0403
        KVER – Kverkfjoll RH8434

          • yup, and ties in with the inflation of the caldera.

            just freaked me a bit, because the damping made me assume it was a water event.

            Lost the Kver cam, but could just be me. Had the 9/30 , but 10/01 wouldn’t come up at all….

            Im running at about 50 kbs tonight 😦

        • i’m thinking it is the one next to the cam, or the one down at the dam !

          Not the SIL, pretty sure, is the older one.

          • I was thinking it was probably near the cam too. And When I saw it on the plots was intrigued with how large it was there versus the other plots. But, that is like that other one from earlier Mopshell and I were discussing. But, at least the one you are talking about makes sense, as the EQ was situated NE of Bard (kverkjoll is basically in that direction). But, the one Mopshell and I were talking about the EQ looked stronger on the djk plot, which is SE of Bard, but EQ recorded NE of Bard….confusing to me 🙂

  4. Morning

    More than one month’s activity compressed in 1 minute.
    Events over Mag 2,5, 99 % quality
    Data from IMO, NOAA, made on Gnu Octave

  5. Ok, folks have shown up at IMO, and are starting to populate maps and graphs.

    Will turn in now, and let you morn folks puzzle this out.

    By the way, 50 f at sunset here today, another BIG cold front behind the number 3 storm heading for Iceland. Gonna be a meter for the lake effect folks, and maybe as much for the Dalek and Dog..

    Night !

  6. Good morning . Up with the larks again (not). Mila 1 is looking perfect for a visible BB event so it definitely won’t happen today. He/she has already shown herself/ himself to be too fickle for that!

  7. Good morning everyone.
    Whilst the “Big One” is incoming and having read that there was a mystery signal during my night (UK) , I tried to find a signature signal for a jokulhaup…..and failed miserably.
    This was partly because I found a rather good DIY teach yourself how to interpret seismograms by Larry Braile, Professor, Purdue University, and got side-tracked. It is quite in depth but it has some exercises that you can download and practice. So I saved it for a dark, cold, winter’s night when there is absolutely nothing on TV, eruptions on VC are quiet and I have an hour or two of uninterrupted time. Now I am not sure how different the seismometers they use are, to those used by the IMO but it looks like a pretty good start to helping me understand exactly what I am seeing on the drum plots.

    Click to access InterpSeis.pdf

    Having briefly scanned the contents I now really appreciate the work of the IMO ladies and gents who provide us with quick results. There is more to verifying signals than I realised. I know they have “tools” to help but it’s still an incredibly skilled job.

    If I could I would send over Hot drinks and a box of cream cakes to All at IMO with thanks 🙂

     photo Coffee-Cup-Full-Off-Cream-Cake_zps6cd2d558.jpg

  8. Is it me or are there more frequent and more marked uplift blue bumps on the blue line on the subsidence map than earlier on. Whole graph seems more chaotic this morning (even ignoring the unreliable bits at the right of the graph)?

        • Hi Grey, If you look back at the 19th September there was a similar period of ‘bumps’. The grey background line shows where these periods have occurred. I’m not sure if they have any significance – weather or rock related for instance.

          • I don’t understand what the grey is at all. Must have some significance, I think, or else they wouldn’t include it on the graphs. First it was called “differential effect” and now it’s “relative displacement” but neither make sense to me. Relative to what?

            • Talla, Betcha I know less about the graphs than anyone else here, so look elsewhere for wisdom! I know to ignore the coloured lines on the last few millimeters of the right hand side of the graph.
              I just ask questions on here which:-
              a. Show my ignorance
              b. Give the experts a nice warm feeling that they are encouraging and educating the rest of us.
              They are!

            • The grey is the actual measure. I’m not sure how often it is measured, whether it is continuous or every 30 seconds, 1 minute and so on, but the collated points are then used to calculate the 30 minute and 180 minute averages.

    • Hi GreyFool,

      I agree with you. I think the pattern of subsidence has changed a bit comparing to the first week ( about until 23 sept) of measurement. The dropping line was then fairly smooth, ‘disturbed’ by a larger quake. Maybe one or two days somewhat bouncier … 🙂 .

      From the 23th the blue line is bumpier and the larger quakes don’t give that sudden fall that much anymore. I am not quite convinced it (always) has something to do with the weatherconditions.

      Related to this I am wondering what influence that hundreds meters of ice has at the GPS measurements. I can imagine the movement of the calderas floor doesn’t match with surface off the ice 1:1 … Seeing many glaciers, I can imagine a thick pack of ice moving is acting not the same than a thick pack of rocks, Ice acts more as a very slow moving fluid, the more I think when its a very thick layer. I have read some posts about this particular c floor- ice surface subject a while ago here. The ongoing posts makes it almost impossible to just find them back …. It’s time to upgrade the VC’s structure is my guess 🙂

      I am new here as a poster :). I have been following the blog intensively since the Barda event started and am enjoying, sharing all you knowledge very much! Thanks!

      • Thanks for that Rob, welcome aboard and you will find folk here very helpful. The operative word is “nice”. I’ve asked things on here which I would have been embarrassed to ask my Geology “A” level teacher (I failed the exam spectacularly, apparently liking rocks with sparkly bits isn’t enough). On here folk just answer encouragingly. Hence I learn!

        • ‘ liking rocks with sparkly bits ‘, you have summed me up in a few words there GreyFool.
          My kids laugh at me that I go into aquarium shops just to see what nice looking rocks they have and occassionally buy small ones for my collection. No longer have time or money to travel UK for rocks so have to resort to other methods. They make a very nice indoor miniature rockery though. 😀

          • Me too! My friends know that any trip to a beach or anywhere with rocks is going to involve me going ‘Oh!’ and coming back with pockets full of pebbles. I like sparkles, but just a change of colour or a wavy line suits me! 😀

            • I collect semi precious pebbles…North Wales beaches are good for that. I used to polish them but the noise of the tumblers annoyed the neighbours I am sure.they certainly eventually grated on my nerves even way out in the garage! Now just happy adding them to garden features which will cause a future archaeologist untold hours of happy speculation as to the religious meaning to these little heaps 😀

          • Liking rocks! A sidetrack/OT but related to volcanic deposits, mainly rhyolite: thundereggs (scientific lithophysae) are my passion. This is a cut example from St.Egidien Germany. Unterrotliegendes (geological); Permian I believe. Some are hollow or have cristals, this one has green japser layers and agate. The rock picture is like a volcano ….

            • That is lovely! Do you cut them open yourself or get them ready cut? I too have a small tumbler machine but I worry about it’s electricity consumption so haven’t used it for years. And I have a load of non-local stone in may garden with the added bit of Roman tile as well so that will doubly confuse the archaeologists/geologists of the future. 🙂

            • @ Talla, this particular one I bought polished. You have really to cut many of them to find one like this. But I cut also, cutting is fun: you never know what inside these round supriserocks.
              Well, a small tumbler is not taking that much electricity, is it? 🙂 Hoovering your house will take the same amount I guess 😉 .

  9. BTW, I’m sure it’s been answered (or widely known to you all), but, how consolidated is the BB massif? I visit Lanzarote a lot and most of the cones there are simply piles of cinders (wrong word, scoria, tephra?) and you could move the whole cone with a shovel. Terrible to climb up! Is BB like that, or is it built of umpteen well cemented layers of solid lava? Or don’t we know (too much permanent ice, no nunatuks) ?

    • I have been wondering about that too! Related question, what kind of volcano is BB really? I have seen this volcano called a glaciovolcano, glacial stratovolcano, a complex all encompassing one,…
      And then, how deep down is this BB volcano? What is the “root” (of this BB volcano) if you will? Actually this mountain (BB volcano) seems pretty measly, more wide than tall. But what kind of geology, meaning rocks, layers, faults, zones etc would there be (under this BB volcano).
      Yes I know I write funny, trying to be better…
      No wonder I was told not to use the “it” word years ago, because this word “it” might be confusing.

      • Have you looked in the Dragon’s Hoard tab? Check under the Topics tab and scroll down to Bardarbunga. I’m sure you’ll find an article by Carl that answers most of your questions. Look down at the bottom of the list for the early articles that explain things before the current event started. Hope this helps (not an expert so can’t answer myself). 🙂

    • A save bet would be to assume that it’s pretty solid. With hundreds of meters of ice grinding at it over time, most of the loose material has probably been wiped away.

  10. Very strong winds at BB but Jokulsarlon is calm and foggy. I just had to capture the blue of the ice there this morning. Lately, I am sure the edge of the Glacier is closer than it was when I first viewed Mila Cam here more than two years ago. I wish I had taken some screen shots then to compare.
     photo jpeg_zpsade65253.jpg

    • We visited there in summer. The edge of the glacier is 7 km away from the camera. I still can’t believe how big the lagoon is. According to our guide the glacier is retreating year on year.

  11. might be something to keep an eye on…(but im pretty sure you will!)
    I did not know the current lava flow was so far back in the mila 1 field of view. I thought it was running
    just in front of and below r2d2?

  12. I don’t know what’s in the baby trailer next to R2D2 but it’s cover is sure flapping about. Hopefully trailer does not contain anything too sensitive or expensive. I hope it was the boss of the Team that forgot to secure it. Can you imagine being the junior technician who messed it up, with the whole world (well, us folk) watching? BTW if the “guilty party” is reading this don’t worry, “the person who never made a mistake never made anything!”. Hopefully IMO Senior Command (or whoever) is as understanding and nice as folk here on VC!

  13. maybe the mila cam operator also thinks it is something to watch, they just panned to the left and zoomed in a bit?
    too bad the weather just turned sour.. And greyfool, Mayby the technician also turned of the flashing red lights of r2d2, i missed them last night. (or has r2d2 died)

  14. I looked in to the Dragons Hoard and nearly lost myself there….
    Could a Dragon/Dragoness kindly point out a good source for Bardar geology?

      • Thanks! Will take a time to sort out those! But little by little, though it seems the seismologists think about the assorted waves which does not give me the meat… the meat, the rocks.
        Now started, and if I find something of interest, will write.
        By the way, the weerstationlangerak- site has a diagram of a proposed chamber system, in the very top, have to click to see. It has a flag for the GPS station too!

    • Thanks for the Kverkfjall screenshot. I can only look at the webcams after 8pm up to 8am, unlimited broadband then.
      The lava seems to be breaking out and spilling over the next lowest land, both north and now south of the fissure. If that carries on much longer, Irpsit’s shield volcano will be a definite possibility.

      • you are welcome….it is all clouded up now…wasn’t a single clear daylight view yesterday off kverkfjoll cam yesterday. Should be clearing up in a bit though.

    • So the lava trail extending behind R2D2 is reaching as far as the left-hand Jokulsa tributary. We need an overflight to see how far the lava has extended souteast.
      Looking forward to the time-lapse video promised by Virtual above. And Dear Husband has just reminded me that it’s the last day of the month, so I can look at the webcams all I like! 😀

      • Well the kverkfjoll cam only updates once every ten minutes, so shouldn’t take too much of your data. From what I was reading, the scientists were able to keep an eye on the lava flow while being on site. I know the road to the site is now inaccessible due to the lava flow, so not sure how they are getting in and out. Possibly helicopters, but that would get expensive very quick. I don’t know what kind of equipment they have at hand, though. Could be the have a plane or helicopter.

        • “Road” is a overstatement, it was only marked trail in that area,
          and does not matter on the sands anyways
          All the area is drivable by 4WD, only takes longer

    • Compare today to a Mila screengrab at about 10pm on 22 September. The right hand tributary has been overridden by the new flow. Carl may have another location for his lake further back towards Dyngjujokhull.

  15. This image is all quakes of every magnitude between the black lines, or down the center where the quake density was the greatest. It really looks like the quake margin is pretty much up and down on both the north line and the south line.

    I do notice at the bottom of the stack of quakes there appears to be almost a flared look to the bottom

    • Thanks Ian, dfm’s plots showed a clear column under Bardar too in the early days, with further column(s) under the dyke. If anyone can come up with a chart looking from the NW I think it could be interesting. I tried looking at the IMO 3D chart but trying to control it was a challenge.

      • If you could draw a sectional view on a picture of BB and the direction to view it I can probably do something.

        Yes, the 3D plots are amazing but sometimes a section view lets you see things better. I do not like the large balls n the IMO page dfm’s is much easier to see.

        The number of quakes on the north versus south I believe shows how the north side is sinking much faster than the south. It also looks like the chamber is 10km under the north side and maybe 12km under the south?

        Staring at patterns of dots can cause you to see things that are not there but I think I can see lines travelling down and away from the center

        I have all of the quake data on Excel now, the data on the weekly sheets is not the same as the main webpage, it has been updated and locations and depths change when they put it on the list.

  16. Am trying to upload a picture for the first time…………..bear with….bear with……

    I saw this snow melting off mila 1 cam. For a second I thought R2D2 had exploded. I bet the picture posting didn’t work……

        • Dunno. (Translation for non Australians: I don’t know 🙂 ) Since, as Carl explained, the dike utilises part of the northern extent of Grímsvötn’s fissure system, I would think it has some effect… But that takes us into the realm of pressures, tensions, strains and stresses and I’ve haven’t sorted that little lot out yet. It’s like a huge tangled ball of different coloured yarns – I keep picking at some of the strands but it’s still pretty tangled for me.

    • It’s going to be interesting to see what happens when the lava cuts off that tributary. I hope they are able to fix Mila 2 soon; it seems to be water-affected since the snow storm two days ago.

      • There are alternative channels for the river further east, if they open up then the lava will probably take the channel past Vadalda where it has been stalled for the last week or so, or so I think 🙂

      • It’s fascinating. I have a screenshot from today set parallel to the webcam, so I can compare the steam height and see if the water is being pushed to the east. It’s going to take a concerted effort by the lava though, as we have seen how the water can cool the lava margin and make a large levee which backs the lava flow up.

    • I *should* be gardening, or housework, or dealing with the glut of veggies from the allotment, or cooking. Instead I am glued to the webcam. Hello, I’m Stars Die and I’m a volcano (and geomorphology) addict. 😛

  17. I have a map taken from one of the blogs following the Holuhraun lava extent. I kept hoping that it would be updated. Unfortunately I did not keep the details of who posted it, and it was on tinypic and has since disappeared. Does anyone know if it has been updated?

    • This is the latest I can find though it’s not very clear. The white outline appears to be the extent of the lava flow on Aug 26 so it has spread outwards quite a lot since then.

      • I think you mean to write ” …on Sept 26″ 🙂 ..was last Friday .. but according to the latest update, a 4 km long tongue of fresh lava has flowed parallel to the old lava and has added at least 2 square km to it. It is now 46+ square km.

        • You’re absolutely right: I did indeed mean Sept 26th! And here it is October 1st already! However am I going to get used to it being October? :-O

          You can see from NASA’s photo how it’s spread out by another 2 sq km.

          • I had been reading this update just minutes before when I saw your post. It was easy to see what you meant. It’s still September here in Iceland though 😉 Terribly windy and rainy at the moment. A train of depressions striking Iceland ..the typical autumn depressions ..the autumns are always very windy here.

            • Being in the tropics, we only get the two seasons and we are moving into the Wet now. So far it’s just been rather warmer and a little more humid. Won’t start getting the rains until late November. Windy here means either a sea breeze (very pleasant), ocean gale (your basic storm) or cyclone (the Southern Pacific version of hurricane). Check out Cyclone Yasi here: http://www.terradaily.com/reports/Key_facts_on_Australias_Cyclone_Yasi_999.html That was a big one!

            • I wish the climate here was a bit closer to the climate you have 😉 The average temp. over the year might be a degree or two higher. I really hate snow, but I can’t really complain where I live in Reykjanes. We get very little snow here. Fortunately we don’t get hurricanes here but we do get storms with hurricane like winds but minus the heavy rain.

            • I have to say that the Dry in particular is absolute paradise! Warm sunny days and cool nights for sleeping – perfect! The only real complaint I have about the Wet is the humidity – air con is essential for sanity! 🙂

            • I like it dry just like you are describing 🙂 esp. the part about cool nights! I can’t take high temp. and humidity ..nothing over 20°C for me when it’s humid or I start sweating rivers lol ..sleeping in a warm room is just impossible for me, I go nuts trying to find a cool spot for my feet. I turn the heat off in my room during nights to be able to sleep. Even though it’s well below freezing outside.

            • Should you ever decide to visit us Downunder, come in June/July – that’s the time of the best weather in the tropics. But for a place like Tasmania, which is in a cool temperate zone, October, late March and April are better months. 🙂

      • Yes, I saw that, but it was the particular geological map I was after an update for. It’s impossible to correlate the two together accurately. I cannot see two reference points in both photos for matching.

        • Lava flow maps used to come out every day but now they are rare and not so clear. I’m waiting on an update too so I can bring out another summary map.

          • I love your summary maps. Do you have them all together somewhere so we could see the progression? Maybe that could be a fun Friday post.

  18. Hello everyone!

    I have a question: does anyone know roughly what kind of time scale it takes for magma to evolve from basalt to rhyolite?

    I ask because i’ve been doing some reading on cascade volcanoes and just learned that newberry shield volcano in oregon is believed to have a rhyolite filled magma chamber throughout the holocene, which i find quite surprising. So far my google-fu hasn’t turned up a satisfactory answer so i thought i’d ask.


  19. Been wondering whether anyone here is watching the flow in the rivers? Read this below and am wondering whether it is just a normal middle of the 🙂 night thing. Also asked Jon. Curiosity killed the cat. Or there went Carl’s lake…

    Update, 11:15: “Something” happened on the river last night – in four hours (9 PM to 1 AM) the meter at Upptyppingar jumped from 112 m³/s to 214 m³/s and the water height from 184 to 241 cm. That’s a surplus of 1 1/2 million cubic meters of water (400 million gallons), the volume of a cube 114 meters on each side. I can’t explain this with weather – normally when the weather gets cold flow rates become lower and steadier. And temperatures were below freezing the whole time. But maybe there’s some weather explanation I’m not seeing. Otherwise, it looks like a flow pattern change due to the advancing lava flow, as if a good chunk of the “lake” drained out. Either that or a little jökulhlaup.

    Hopefully we’ll get a clarification soon. >>


    • I think I would place more faith in the pronouncements of IMO

      “No change was detected in water monitoring that cannot be explained with changing weather.”

      I think they probably have a really good handle on changes in river heights due to storms melting recently fallen snow. 🙂

  20. I am trying very hard to stop wishing the day away, I think tonight’s lava flow display could be the best yet 😉

    • Hopefully the weather will be clear tonight, and just maybe someone will come and fix the close up camera. Mila really should care about providing as good view as possible at all times. At least before winter is in full force in the area.

  21. 2 things on my mind right now…, 1) BB GPS is amost flat since morning 2) lots of EQ on the N side of the caldera (very close to where this whole thing stated back in August).

    It looks to me that this subsidence thingy should stop at some point and at some point after that a failure or the rim on the N side of the caldera…

    • Look at the entire trendline. You’re looking at way too short of a time scale. There have been “steps” and flat areas in the GPS dropping almost every day.

      But yes, at some point in the infinite future, the subsidence will stop :), predicting “when” is the challenging part.

    • It’s very likely over 100 meters tall. I remember reading many days ago that it had reached 70 meters. It’s been very active since and must have added quite a few meters to its height since.

      • I am spending far too much time watching this wonderful play of light and dark on this cam this evening. Absolutely spellbinding watching that lava flow interacting with the water.

        • It can be mesmerizing. Clouds forming and disappearing and several kinds of weather every hour. And the light from the low sun playing on the clouds can really be fascinating 🙂 I have already sat for 2 hours without getting anything done. Time to go shopping now !

          • Thanks for these screengrabs, I was away preparing dinner. I have wasted away this afternoon, mesmerising is definitely the word of the day.

      • Yes it is, and it could be much more violent! We could have big explosions forming pseudocraters (rootless cones) but the conditions don’t seem quite right for that.

  22. Don’t know if anyone will see this but do we have any new vents in view??? i’m behind times. Seems like a lot going on. (mots refrains from using the word weird which was misunderstood before) Best! still hanging in there, motsfo

    • Hi motsfo, no new vents but the eruption site appears to be two areas of venting right next to each other. That is how it appears from the heat signatures anyway. Apart from that all the steam is from lava and river playing happily together. 😉

    • No – just a new stream of lava (along the south side of the lava field) has reached the river and is trying to boil it dry.

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